The water is completely still until the later stages of boiling, but there’s this rising noise from very early on.
In: Engineering
The water doesn’t reach 100 C all at once; the water near the heating element will turn into gas sooner.
The noise is the water near the heating element turning into steam, rising and either turning fluid again when the temperature at the top is still low, or escaping the kettle as steam. The gas bubbles collapsing again makes more noise than the steam escaping – so after a while you just hear the bubbling.
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